exam Maths Puzzle Numerical Ability

You own a business that sells silk-screened shirts. You want to know how many shirts you must sell to "break even". Your costs are 1500$ for the silk-screen equipment, plus 18$ in

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In the month of June of 2006 Dr. Smith's gross production sales were $153,120.79. In the month of June for 2007 Dr. Smith's gross production sales were 112,425.97. What is the perc If 3x+y=90 and 10<=x<=25 what is the least possible value of y?

And alss slove for d
d=3x/y*y+1/x